Anti-burglar window lock



Nov. 10, 1959 w. H. MARKoVlcl-l ANTIfBURGLAR WINDOW LOCK Filed Oct. 9.1957 INVENTOR.

William H. Mar/fo Vch.

ATTORNEY@ ber 8, a bottom member 9,

United States Patent 2,912,268? Patented Nov. 10, 19,59

ice

ANrI-BURGLAR WINDOW LOCK william H. Markovich, Kansas city, M0.Applicatin october 9, 1951, serial No. 689,106

f1 claim. (cl. 292-262) This invention relates to improvements for locksin windows, and more particularly, to a novel anti-burglar lock forsliding window sash and the like to retain the sash in closed or partlyopen position of any desired extent. The principal objects of thepresent invention are to provide a lock capable of being installed onany sliding type window sash .and limiting the movement thereof relativeto the frame or the other sash; to provide such 'a lock havingtelescoping members and movement limiting elements whereby the sashcannot be opened or the limiting elements changed from the outsidewithout breaking of the window pane and removing a fastening device ofsaid locking members; to provide such a lock adapted to be mounted toappear as part of the window sash; and to provide such a window sashlock that is economical to manufacture, sturdy, durable and eicient andpositive in operation, that is incapable of being accidentally releasedand which may be applied to window sash without alteration of same.

In accomplishing these and other objects of the present invention, Ihave provided improved details of structure, the preferred form of whichis illustrated in the accompanying drawing, wherein:

Fig. l is a perspective `view of the anti-burglar window lock installedon window sash and in position permitting limited raising movement ofthe lower sash.

Fig. 2 is a vertical sectional view through the window lock installed onwindow sash.

Fig. 3 is a horizontal sectional view through the window lock taken onthe line 3-3, Fig. 2.

Fig. 4 is a disassembled perspective view of the winl dow lock members.

Referring more in detail to the drawing:

1 designates a window frame in which is slidably mounted an upper sash 2and a lower sash 3. 'I'he window frame and sash may be of anyconventional sliding window sash structure, and in the illustratedstructure, the upper window sash has a top member 4, bottom member 5 andside members 6 in which is mounted a window pane 7. The lower sash 3includes a top memand side members mount ing a window pane 11.

12 generally designates an anti-burglar window lock adapted to besecured to the window sash to selectively limit relative slidingmovement thereof or hold the sash in window opening closing position.The window lock 12 consists of relatively slidable members adapted to beextended and contracted, and in the illustrated structure there aretelescoping members 13 and 14 mounted for relative longitudinal movementfor extension and contraction of the length thereof. The telescopingmembers 13 and 14 may be of any desired geometric configuration in crosssection such as circular, square or the like. However, in theillustrated structure they are of channel formation. The member 13consists of an elongate channel having a web 15 with flanges 16extending from the side edges thereof, said channel ange's preferablyconverging whereby the spacing between the edges 17 of said tlanges isvless in width than the web 15. A bracket 18 is suitably secured as bywelding to an end 19 of the member 13. The bracket 18 is of suitableshape to engage the lower sash and preferably is of angle shape with thea'nge 20 to which the member 13 is secured adapted to engage the upperface 21 of the lower window sash member 8, and the other ange 22 adaptedto engage the inner face 23 of said sash member 8. The flange 22 hasapertures 24 preferably of keyhole shape for receiving fastening devicessuch` as screws 2S which extend into the member 8 to secure the bracketsthereto. Loosening of the screws 25 will permit lateral movement of thebracket and removal thereof from the window sash as the enlarged portion26 of the keyhole openings Z5 is larger than the head 27 of therespective screws.

The member 14 is also of a channel shape of a size whereby it isslidably received inside of the way formed by the channel member 13,with the web 28 and flanges 29 of the member 14y closely and slidablyengaging the inside surfaces of the web 15 and flanges 16 of the member13. The anges 29 also converge whereby the spac` ing between the edges30 of said ilanges is less in width than the web 28. The free end 31 ofthe member 14 extends into the free end 32 of the member 13, and theupper end of the member 14 is suitably secured as by welding to a flange33 of a bracket member 34 preferably of angle shape whereby a verticalange 35 of said bracket engages the inside face 36 of the top member 4of the upper sash 2 and is suitably secured thereto by fastening devicessuch as screws 37 which extend through keyhole openings 38, the heads 39of the screws 37 being smaller than the enlarged portion 40 of thekeyhole openings whereby when the screws 37 are loosened the bracket 34may be moved laterally and removed from the window sash.

The web 28 of the member 14 has a plurality of spaced openings 41arranged longitudinally thereof and adapted to receive a stop member 42.In the illustrated structure, the member 42 is a screw, the shank 43 ofwhich extends through a selected opening and is secured in place by anut 44 threaded thereon. The stop 42 may be positioned in any selectedopening 41 and serve as an abutment limiting raising movement of thelower sash or lowering movement of the upper sash to the spacing betweenthe upper end 32 of the member 13 and the stop 42 when the sash are inwindow closing posi.- tion.

The lock member 13 has an opening 45 in the web 15 thereof adapted to beregistered with selected openings 41 in the upper lock member 14 wherebythe stop screw 42 may extend through the registered openings and besecured therein by the nut 44 to lock the upper and lower sash inselected position which may be fully closed or partially openeddepending upon the location of the openings 41 and 45 through which thestop member extends.

The members 13 and 14 are of suitable length whereby when installed andthe window sash are in closed position, the member 14 extends into themember 13 sulciently to support and adequately retain the members in asturdy structure whereby it cannot be dislodged even though the windowpane is broken until the stop member 42 is removed or the fasteningdevices 25 and 37 are loosened.

It is preferable that the brackets 18 and 34 be secured to therespective window sash as illustrated and described. However, ifdesired, the upper bracket 34 may be left free so that the telescopingmembers form a post which on raising movement of the lower sash willcause the upper end to engage the top of the window frame to limitraising movement of the lower sash or hold same in closed position asdesired.

It is preferable that the lock be placed midway between the sides of thewindow frame whereby it has the appearance of a divider in an upper sashhaving sectional panes, and if the upper sash is of the sectional panetype with a vertical divider, the lock members may be aligned with saiddivider whereby from the outside the lock is substantially hidden by thedivider.

It is to be understood that while I have illustrated and described oneform of my invention, it is not to be limited to the specific form orarrangement of parts herein described and shown except insofar as suchlimitations are included in the claim.

What I claim and desire to secure by Letters Patent is:

A lock for securing relatively movable sliding window sash in selectedpositions comprising, an elongate member having upper and lower ends, abracket on the lower end of said elongate member and having angedportions, said bracket having keyhole openings therein, fastening meansextending through the keyhole openings for connection of the bracket toone window sash, said elongate member having a channel shape with a weband opposed converging anges defining a longitudinal Way therein, asecond elongate member slidable in said longitudinal way and having anupper end extending from the upper end of said rst-named elongatemember, said second elongate member having a portion tting saidlongitudinal way and permitting only relative longitudinal movementthereof, a second bracket xed on the upper end of the second-namedelongate member in spaced relation to the rst-named elongate member,said second bracket having keyhole openings therein, fastening meansextending through the keyhole openings in said second bracket forconnection of said second bracket to the other window sash, said secondelongate member having a plurality of longitudinally spaced openingstherein, the rst-named elongate member having an opening thereinregistrable with a selected opening in the second elongate member, andstop means secured in said registered openings to lock said elongatemembers against relative movement.

References Cited in the le of this patent UNITED STATESV PATENTS 429,167Curtiss June 3, 1890 1,203,974 Callow et al Nov. 7, 1916 1,338,339Talbert Apr. 27, 1920 1,601,524 Gibbons Sept. 28, 1926 1,851,701 GollMar. 29, 1932 2,714,033 Lewgowd July 26, 1955

